I started out with Signature gel system, but everyone was asking for Shellac so I went on the conversion course and haven't looked back. All as above, easy removal, easy application and lots of colours with additives and layering options to make lots more. No need to buff the nail prior to applying, so slightly quicker on the prep side of things. I never get asked for Gelish but did buy one bottle for personal trial - it was lovely to use, but I couldn't get it off!!! That really put me off as I'd heard it was difficult to remove, but geeks on here don't seem to have too much of a problem.